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  • iPhone SDK: App crashing when trying to scroll through table

    - by iPhone Developer
    I have a view controller with a table on it. When the app starts, it loads the first 5 visble cells. That works as expected. My problem is that, when I try to scroll down the app crashes with this error. Any help appreciated. 2010-06-06 12:25:42.547 iphoneos[18238:207] * -[NSCFString tableView:cellForRowAtIndexPath:]: unrecognized selector sent to instance 0x451a980 2010-06-06 12:25:42.549 iphoneos[18238:207] Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '** -[NSCFString tableView:cellForRowAtIndexPath:]: unrecognized selector sent to instance 0x451a980' Here is my code to load cells. UITableViewCell * cell = nil; NSInteger index = [indexPath indexAtPosition:1]; NSLog(@"WHAT IS INDEX %i", indexPath); RoundedGradientTableViewCell *retailerCell = (RoundedGradientTableViewCell *)[tb dequeueReusableCellWithIdentifier:@"RET"]; if(!retailerCell){ retailerCell = [[[RoundedGradientTableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:@"RET"] autorelease]; } [retailerCell setArcSize:5.0]; [retailerCell setStrokeSize:1.0]; [retailerCell setStrokeColor:[UIColor clearColor]]; [retailerCell setBackgroundFillColor:[UIColor clearColor]]; [retailerCell setBackgroundColor:[UIColor clearColor]]; Retailer *retailer = [self retailerAtIndex:index]; if(retailer){ [[retailerCell textLabel] setText:[retailer name]]; if([retailer hasImage]){ [[retailerCell contentImageView] setImage:[retailer image]]; } } else { [[retailerCell textLabel] setText:@"No title"]; } cell = retailerCell; [cell setSelectionStyle:UITableViewCellSelectionStyleNone]; NSLog(@"retailer: %@ ", [retailer name]); NSLog(@"log: %i ", index); return cell;

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  • Ruby: how does constant-lookup work in instance_eval/class_eval?

    - by Alan O'Donnell
    I'm working my way through Pickaxe 1.9, and I'm a bit confused by constant-lookup in instance/class_eval blocks. I'm using 1.9.2. It seems that Ruby handles constant-lookup in *_eval blocks the same way it does method-lookup: look for a definition in receiver.singleton_class (plus mixins); then in receiver.singleton_class.superclass (plus mixins); then continue up the eigenchain until you get to #<Class:BasicObject>; whose superclass is Class; and then up the rest of the ancestor chain (including Object, which stores all the constants you define at the top-level), checking for mixins along the way Is this correct? The Pickaxe discussion is a bit terse. Some examples: class Foo CONST = 'Foo::CONST' class << self CONST = 'EigenFoo::CONST' end end Foo.instance_eval { CONST } # => 'EigenFoo::CONST' Foo.class_eval { CONST } # => 'EigenFoo::CONST', not 'Foo::CONST'! Foo.new.instance_eval { CONST } # => 'Foo::CONST' In the class_eval example, Foo-the-class isn't a stop along Foo-the-object's ancestor chain! And an example with mixins: module M CONST = "M::CONST" end module N CONST = "N::CONST" end class A include M extend N end A.instance_eval { CONST } # => "N::CONST", because N is mixed into A's eigenclass A.class_eval { CONST } # => "N::CONST", ditto A.new.instance_eval { CONST } # => "M::CONST", because A.new.class, A, mixes in M

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  • Orientation issue while presenting Modal ViewController

    - by Jacky Boy
    Current scenario: Right now I am showing a UIViewController using a segue with the style Modal and presentation Sheet. This Modal gets its superview bounds change, in order to have the dimensions I want, like this: - (void)viewWillLayoutSubviews { [super viewWillLayoutSubviews]; self.view.superview.bounds = WHBoundsRect; } The only allowed orientations are UIInterfaceOrientationLandscapeLeft and UIInterfaceOrientationLandscapeRight. Since the Modal has some TextFields and the keyboard would be over the Modal itself, I am changing its center so it moves a bit to the top. The problem: What I am noticing right now, is that I am unable to work with the Y coordinate. In order for it move vertically (remember it's on landscape) I need to work with the X. The problem is that when it's UIInterfaceOrientationLandscapeLeft I need to come with a negative X. And when it's UIInterfaceOrientationLandscapeRight I need to come with a positive X. So it seems that the X/Y Coordinate System is "glued" to the top left corner while in Portrait and when an orientation occurs, it's still there: What I have done So I have something like this: UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation]; NSInteger newX = 0.0f; if (orientation == UIInterfaceOrientationLandscapeLeft) { // Logic for calculating the negative X. } else { // Logic for calculating the positive X. } It works exactly like I want, but it seems a very fragile implementation. Am I missing something? Is this the expected behaviour?

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  • pdf page display problem in ipad

    - by mohsinpathan
    I am able to parse content of pdf. I am able to display pdf page as a image in scroll view. but pdf page is cut when width is more than scroll view. I want to display pdf whole page without lost its quality and contents. please give me hint.`NSArray *temp=[[contentsAtPath objectAtIndex:i]componentsSeparatedByString:@".pdf"]; NSString *c=[temp objectAtIndex:0]; filePath=[[NSString alloc] initWithString:[[NSBundle mainBundle] pathForResource:c ofType:@"pdf" inDirectory:@"appPdf"] ]; [pdfNames addObject:filePath]; initialPage=1; mainString=[[NSMutableString alloc] init]; myTable=nil; myTable = CGPDFOperatorTableCreate(); CGPDFOperatorTableSetCallback(myTable, "TJ", arrayCallback); CGPDFOperatorTableSetCallback(myTable, "Tj", stringCallback); CGRect pdfSize = GetPdfSize(UIGraphicsGetCurrentContext(), initialPage, [filePath UTF8String],myTable,mainString); //UIImageView *imgV=[[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 598,768)]; UIImageView *imgV=[[UIImageView alloc]initWithFrame:CGRectMake(0, 0, pdfSize.size.width,pdfSize.size.height)]; UIGraphicsBeginImageContext(CGSizeMake(pdfSize.size.width,pdfSize.size.height)); MyDisplayPDFPage(UIGraphicsGetCurrentContext(), initialPage, [filePath UTF8String],myTable,mainString); imgV.image=UIGraphicsGetImageFromCurrentImageContext(); imgV.image=[imgV.image rotate:UIImageOrientationDownMirrored]; UIButton *doneBtn = [UIButton buttonWithType:UIButtonTypeCustom]; doneBtn.frame=CGRectMake(0,0,598,pdfSize.size.height); [doneBtn setImage:imgV.image forState:UIControlStateNormal]; [doneBtn addTarget:self action:@selector(getDetail) forControlEvents:UIControlEventTouchDown]; doneBtn.tag=i+1; [scrollView addSubview:doneBtn];`

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  • Rails runner command not saving to cache

    - by mark
    Hi I'm having a bit of a problem with a cron task generated by rails whenever plugin that should store remote data in the rails cache for display. What I have is this: schedule.rb set :path, '/var/www/apps/tuexplore/current' every 1.hour do runner "Weather.cache_remote", :environment => :production end calls this model class Weather def self.cache_remote Rails.cache.write('weather_data', Net::HTTP.get_response(URI.parse(WEATHER_URL)).body) end end Calling whenever returns this PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/home/deploy/.gem/ruby/1.8/bin 0 * * * * /var/www/apps/tuexplore/current/script/runner -e production "Weather.cache_remote" This doesn't work. Calling the weather model method from a controller works fine, but I need to schedule it hourly. The cron task causes a "Cache write: weather_data" entry to appear in the production log but data isn't stored nor output into the page. Additional information, I can log into production console and run Weather.cache_remote, then read the data from the rails cache. I'd be really appreciative if someone could point out the error of my ways. If further explanation is needed please ask. Thanks in advance for any pointers.

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  • Blackberry Asynchronous HTTP Requests - How?

    - by Kai
    The app I'm working on has a self contained database. The only time I need HTTP request is when the user first loads the app. I do this by calling a class that verifies whether or not a local DB exists and, if not, create one with the following request: HttpRequest data = new HttpRequest("http://www.somedomain.com/xml", "GET", this); data.start(); This xml returns a list of content, all of which have images that I want to fetch AFTER the original request is complete and stored. So something like this won't work: HttpRequest data = new HttpRequest("http://www.somedomain.com/xml", "GET", this); data.start(); HttpRequest images = new HttpRequest("http://www.somedomain.com/xmlImages", "GET", this); images.start(); Since it will not treat this like an asynchronous request. I have not found much information on adding callbacks to httpRequest, or any other method I could use to ensure operation 2 does not execute until operation 1 is complete. Any help would be appreciated. Thanks

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  • Rotate using a transform, then change frame origin, and view expands??

    - by ZaBlanc
    This is quite the iPhone quandry. I am working on a library, but have narrowed down my problem to very simple code. What this code does is create a 50x50 view, applies a rotation transform of a few degrees, then shifts the frame down a few times. The result is the 50x50 view is now much larger looking. Here's the code: // a simple 50x50 view UIView *redThing = [[UIView alloc] initWithFrame:CGRectMake(50, 50, 50, 50)]; redThing.backgroundColor = [UIColor redColor]; [self.view addSubview:redThing]; // rotate a small amount (as long as it's not 90 or 180, etc.) redThing.transform = CGAffineTransformRotate(redThing.transform, 0.1234); // move the view down 2 pixels CGRect newFrame = CGRectMake(redThing.frame.origin.x, redThing.frame.origin.y + 2, redThing.frame.size.width, redThing.frame.size.height); redThing.frame = newFrame; // move the view down another 2 pixels newFrame = CGRectMake(redThing.frame.origin.x, redThing.frame.origin.y + 2, redThing.frame.size.width, redThing.frame.size.height); redThing.frame = newFrame; // move the view down another 2 pixels newFrame = CGRectMake(redThing.frame.origin.x, redThing.frame.origin.y + 2, redThing.frame.size.width, redThing.frame.size.height); redThing.frame = newFrame; // move the view down another 2 pixels newFrame = CGRectMake(redThing.frame.origin.x, redThing.frame.origin.y + 2, redThing.frame.size.width, redThing.frame.size.height); redThing.frame = newFrame; So, what the heck is going on? Now, if I move the view by applying a translation transform, it works just fine. But that's not what I want to do and this should work anyway. Any ideas?

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  • From Sinatra Base object. Get port of application including the base object

    - by Poul
    I have a Sinatra::Base object that I would like to include in all of my web apps. In that base class I have the configure method which is called on start-up. I would like that configure code to 'register' that service with a centralized database. The information that needs to be sent when registering is the information on how to contact this web-service... things like host and port. I then plan on having a monitoring service that will spin over all registered services and occasionally ping them to make sure they are still up and running. In the configure method I am having trouble getting the port information. The 'self.settings.port' variable doesn't seem to work in this method. a) any ideas on how to get the port? I have the host. b) is there a sinatra plug-in that already does something like this so I don't have to write it myself? :-) //in my Sinatra::Base code. lets call it register_me.rb RegisterMe < Sinatra::Base configure do //save host and port information to database end get '/check_status' //return status end //in my web service code require register_me //at this point, sinatra will initialize the RegisterMe object and call configure post ('/blah') //example of a method for this particular web service end

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  • Generating URLs when not using an integer as an id?

    - by Synthesezia
    So I'm building a blog engine which has /articles/then-the-article-permalink as it's URL structure. I need to have prev and next links which will jump to the next article by pub_date, my code looks like this: In my articles#show @article = Article.find_by_permalink(params[:id]) @prev_article = Article.find(:first, :conditions => [ "pub_date < ?", @article.pub_date]) @next_picture = Article.find(:first, :conditions => [ "pub_date > ?", @article.pub_date]) And in my show.html.erb <%= link_to "Next", article_path(@next_article) %> <%= link_to 'Prev', article_path(@prev_article) %> In my articles model I have this: def to_param self.permalink end The specific error message I get is: article_url failed to generate from {:action=>"show", :controller=>"articles", :id=>nil}, expected: {:action=>"show", :controller=>"articles"}, diff: {:id=>nil} Without the prev and next everything is working fine but I'm out of ideas as to why this isn't working. Anyone want to helo?

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  • How do I implement configurations and settings?

    - by Malvolio
    I'm writing a system that is deployed in several places and each site needs its own configurations and settings. A "configuration" is a named value that is necessary to a particular site (e.g., the database URL, S3 bucket name); every configuration is necessary, there is not usually a default, and it's typically string-valued. A setting is a named value but it just tweaks the behavior of the system; it's often numeric or Boolean, and there's usually some default. So far, I've been using property files or thing like them, but it's a terrible solution. Several times, a developer has added a requirement for a configuration but not added the value to file for the live configuration, so the new release passed all the tests, then failed when released to live. Better, of course, for every file to be compiled — so if there's a missing configuration, or one of the wrong type, it won't get past the compiler — and inject the site-specific class into the build for each site. As a bones, a Scala file can easy model more complex values, especially lists, but also maps and tuples. The downside is, the files are sometimes maintained by people who aren't developers, so it has to be pretty self-explanatory, which was the advantage of property files. (Someone explain XML configurations to me: all the complexity of a compilable file but the run-time risk of a property file.) What I'm looking for is an easy pattern for defining a group required names and allowable values. Any suggestions?

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  • routes as explained in RoR tutorial 2nd Ed?

    - by 7stud
    The author, Michael Hartl, says: Here the rule: get "static_pages/home" maps requests for the URI /static_pages/home to the home action in the StaticPages controller. How? The type of request is given, the url is given, but where is the mapping to a controller and action? My tests all pass, though. I also tried deleting all the actions in the StaticPagesController, which just looks like this: class StaticPagesController < ApplicationController def home end def about end def help end def contact end end ...and my tests still pass, which is puzzling. The 2nd edition of the book(online) is really frustrating. Specifically, the section about making changes to the Guardfile is impossible to follow. For instance, if I instruct you to edit this file: blah blah blah dog dog dog beetle beetle beetle jump jump jump and make these changes: blah blah blah . . . go go go . . . jump jump jump ...would you have any idea where the line 'go go go' should be in the code? And the hint for exercise 3.5-1 is flat out wrong. If the author would put up a comment section at the end of every chapter, the rails community could self-edit the book.

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  • iPhone UISlider not visible

    - by John Qualis
    I want to add a UISlider to my app programmatically without using the IB. I am adding a UISlider to my UIViewController using the code below. However I don't see the slider when the view comes up. What am I missing? I am using iPhone SDK 3.1.2. Appreciate any help. @synthesize slider; .... - (void)viewDidLoad { ... ... slider = [[UISlider alloc] initWithFrame: CGRectMake(0, 480 - 80, 300, 20)]; slider.minimumValue = 0.0; slider.maximumValue = 100.0; slider.tag = 0; slider.value = 50; slider.continuous = YES; slider.enabled = YES; [slider addTarget:selfaction:@selector(handleSlider:)forControlEvents:UIControlEventValueChanged]; self.view addSubview:slider]; In the .h file ... UISlider *slider; ... @property (nonatomic, retain) UISlider *slider; - (void) handleSlider:(id)sender;

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  • Are Tuples a poor design decision in C#?

    - by Jason Webb
    With the addition of the Tuple class in .net 4, I have been trying to decide if using them in my design is a bad choice or not. The way I see it, a Tuple is a shortcut to writing a result class (I am sure there are other uses too). So this: public class ResultType { public string StringValue { get; set; } public int IntValue { get; set; } } public ResultType GetAClassedValue() { //..Do Some Stuff ResultType result = new ResultType { StringValue = "A String", IntValue = 2 }; return result; } Is equivalent to this: public Tuple<string, int> GetATupledValue() { //...Do Some stuff Tuple<string, int> result = new Tuple<string, int>("A String", 2); return result; } So setting aside the possibility that I am missing the point of Tuples, is the example with a Tuple a bad design choice? To me it seems like less clutter, but not as self documenting and clean. Meaning that with the type ResultType, it is very clear later on what each part of the class means but you have extra code to maintain. With the Tuple<string, int> you will need to look up and figure out what each Item represents, but you write and maintain less code. Any experience you have had with this choice would be greatly appreciated.

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  • about c# OBJECTS and the Possibilties it has.

    - by user527825
    As a novice programmer and i always wonder about c# capabilities.i know it is still early to judge that but all i want to know is can c# do complex stuffs or something outside windows OS. 1- I think c# is a proprietary language (i don't know if i said that right) meaning you can't do it outside visual studio or windows. 2-also you cant create your own controller(called object right?) like you are forced to use these available in toolbox and their properties and methods. 3-can c# be used with openGL API or DirectX API . 4-Finally it always bothers me when i think i start doing things in visual studio, i know it sounds arrogant to say but sometimes i feel that i don't like to be forced to use something even if its helpful, like i feel (do i have the right to feel?) that i want to do all things by myself? don't laugh i just feel that this will give me a better understanding. 5- is visual c# is like using MaxScript inside 3ds max in that c# is exclusive to do windows and forms and components that are windows related and maxscript is only for 3d editing and manipulation for various things in the software. If it is too difficult for a beginner i hope you don't answer the fourth question as i don't have enough motivation and i want to keep the little i have. thank you for your time. Note: 1-sorry for my English, i am self taught and never used the language with native speakers so expect so errors. 2-i have a lot of questions regarding many things, what is the daily ratio you think for asking (number of questions) that would not bother the admins of the site and the members here. thank you for your time.

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  • If statement question iphone?

    - by NextRev
    I am creating a game where where you complete shapes and the area gets filled in. However, if there is an enemy bird within your shape, it will not fill in. I want to make it so that if you do trap a bird within your shape, you will lose a life. How can I write an if statement that pretty much says if the below code doesn't take place, then you lose a life. If it helps losing a life is called doDie in my code. -(void)fillMutablePath{ CGPoint movePoint = CGPointFromString([pointsToFillArray objectAtIndex:0]); CGPathMoveToPoint(fillPath, NULL, movePoint.x, movePoint.y); for (int i=0; i<[pointsToFillArray count]; i++) { CGPoint tempPoint = CGPointFromString([pointsToFillArray objectAtIndex:i]); CGPathAddLineToPoint(fillPath, NULL, tempPoint.x, tempPoint.y); } CGContextAddPath(gameViewObj._myContext, fillPath); CGContextFillPath(gameViewObj._myContext); CGPathRelease(fillPath); [pointsToFillArray removeAllObjects]; } if(fillMutablePath doesn't take place when making a shape){ [self doDie]; } Like i said above, the reason fillMutablePath wouldn't take place is because a bird would be trapped within the shape. Any help would be much appreciated!!

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  • how to create static line in coreplot

    - by Rémi Bédard-Couture
    I am trying to make my control lines static so instead of being displayed as part of the graph(the control lines are moving with the graph), they would be displayed like an axis the app can only scroll horizontally i'm talking about the two red line and the green line(which i put over the x axis) this is how i do my lines: // Center line CPTScatterPlot *centerLinePlot = [[CPTScatterPlot alloc] init]; centerLinePlot.identifier = kCenterLine; CPTMutableLineStyle *lineStyle = [CPTMutableLineStyle lineStyle]; lineStyle.lineWidth = 2.0; lineStyle.lineColor = [CPTColor greenColor]; centerLinePlot.dataLineStyle = lineStyle; centerLinePlot.dataSource = self; [graph addPlot:centerLinePlot]; but maybe it has something to do with the displayed range: ////////ajuste la portion a voir if(data.Resultats.count>10) { plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromDouble(data.Resultats.count - 10) length:CPTDecimalFromDouble(10)]; } plotSpace.yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromDouble(RangeMin) length:CPTDecimalFromDouble(RangeMax-RangeMin)]; // Adjust visible ranges so plot symbols along the edges are not clipped CPTMutablePlotRange *xRange = [plotSpace.xRange mutableCopy]; CPTMutablePlotRange *yRange = [plotSpace.yRange mutableCopy]; //place l'axe x sur la ligne de controle pour voir les WorkOrders x.orthogonalCoordinateDecimal = CPTDecimalFromDouble(center); //x.orthogonalCoordinateDecimal = yRange.location; //y.orthogonalCoordinateDecimal = xRange.location; //x.visibleRange = xRange; //y.visibleRange = yRange; //x.gridLinesRange = yRange; //y.gridLinesRange = xRange; [xRange expandRangeByFactor:CPTDecimalFromDouble(1.15)];//1.05 [yRange expandRangeByFactor:CPTDecimalFromDouble(1.15)]; plotSpace.xRange = xRange; plotSpace.yRange = yRange;

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  • How do I create a simple Windows form to access a SQL Server database?

    - by NoCatharsis
    I believe this is a very novice question, and if I'm using the wrong forum to ask, please advise. I have a basic understanding of databasing with MS SQL Server, and programming with C++ and C#. I'm trying to teach myself more by setting up my own database with MS SQL Server Express 2008 R2 and accessing it via Windows forms created in C# Express 2010. At this point, I just want to keep it to free or Express dev tools (not necessarily Microsoft though). Anyway, I created a database using the instructions provided here and I set the data types appropriately for each column (no errors in setup at least). Now I'm designing the GUI in C# Express but I've kind of hit a wall as far as the database connection. Is there a simple way to access the database I created locally using C# Express? Can anyone suggest a guide that has all this spelled out already? I am a self-learner so I look forward to teaching myself how to use these applications, but any pointers to start me off in the right direction would be greatly appreciated.

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  • Java function changing input

    - by Doodle
    I would like to go from one number to another. For example if I started at 6 and my goal was 10 I want a function that on every pass would bring me from 6 towards 10 or if I had the number 14 and my goal was 9 it would count down from 14 towards 9.So far I have (this is written in Processing a Java Api but there is essentially no difference from regualr Java, draw is just a continuous loop) int x=100; void draw(){ x=towards(x,10); println(x); } int towards(int current ,int target){ if(current!=target){ if (current <target){ current=current+1; } else { current=current-1; } } return current; } this gives me the results I would like but I would like to have everything in side of the towards() function. When I replace X with a variable it of course resets it self to the static variable. To sum it up how can I pass a variable to a function and have that variable thats been passed change on every subsequent pass. I have looked into recursion as a solution but that of just brings me to a final solution. I can pass the count to an array but wouldn't like to do that either.

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  • Who to access a UIButton using tag and button change image?

    - by ste
    I need to change the images on a matrix of UIButtons, and the only thing I know of to address the buttons, is the tag. But I can not find a way to actually us this identifier. The buttons are created programmatically during viewDidLoad. Here is the code for creating the buttons: #define N_ROWS 4 #define N_COLS 3 int N_IMG = 0; for (int a = 0; a < N_COLS; a++) { for (int j = 0; j < N_ROWS; j++) { UIButton *aButton = [UIButton buttonWithType:UIButtonTypeCustom]; aButton.frame = CGRectMake(a * 65.0 + 25, j * 65.0 + 15, 10.0, 10.0); aButton.tag = j + a * N_ROWS + 1; [aButton setBackgroundColor:[UIColor redColor]]; N_IMG = N_IMG++; [self.view addSubview:aButton]; number_sorted = 1; } } Here is the code for setting the image: - (IBAction)set_image:(id)sender { #define N_ROWS 4 #define N_COLS 3 int N_IMG = 0; for (int a = 0; a < N_COLS; a++) { for (int j = 0; j < N_ROWS; j++) { uibutton aButton.tag == (j + a * N_ROWS + 1) setImage:[UIImage imageNamed:[puzzles objectAtIndex:N_IMG]] forState:UIControlStateNormal]; N_IMG = N_IMG++; } } } This is the code where the truble starts: uibutton aButton.tag == (j + a * N_ROWS + 1) Who can I set this up to work?

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  • Django IntegrityError: foreign key violation upon delete

    - by Lukasz Korzybski
    I have Order and Shipment model. Shipment has a foreign key to Order. class Order(...): ... class Shipment() order = m.ForeignKey('Order') ... Now in one of my views I want do delete order object along with all related objects. So I invoke order.delete(). I have Django 1.0.4, PostgreSQL 8.4 and I use transaction middleware, so whole request is enclosed in single transaction. The problem is that upon order.delete() I get: ... File "/usr/local/lib/python2.6/dist-packages/django/db/backends/__init__.py", line 28, in _commit return self.connection.commit() IntegrityError: update or delete on table "main_order" violates foreign key constraint "main_shipment_order_id_fkey" on table "main_shipment" DETAIL: Key (id)=(45) is still referenced from table "main_shipment". I checked in connection.queries that proper queries are executed in proper order. First shipment is deleted, after that django executes delete on order row: {'time': '0.000', 'sql': 'DELETE FROM "main_shipment" WHERE "id" IN (17)'}, {'time': '0.000', 'sql': 'DELETE FROM "main_order" WHERE "id" IN (45)'} Foreign key have ON DELETE NO ACTION (default) and is initially deferred. I don't know why I get foreign key constraint violation. I also tried to register pre_delete signal and manually delete shipment objects before delete on order is called, but it resulted in the same error. I can change ON DELETE behaviour for this key in Postgres but it would be just a hack, I wonder if anyone has a better idea what's going on here. There is also a small detail, my Order model inherits from Cart model, so it actually doesn't have id field but cart_ptr_id and after DELETE on order is executed there is also DELETE on cart, but it seems unrelated? to the shipment-order problem so I simplified it in the example.

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  • Django: Paginator + raw SQL query

    - by Silver Light
    Hello! I'm using Django Paginator everywhere on my website and even wrote a special template tag, to make it more convenient. But now I got to a state, where I need to make a complex custom raw SQL query, that without a LIMIT will return about 100K records. How can I use Django Pagintor with custom query? Simplified example of my problem: My model: class PersonManager(models.Manager): def complicated_list(self): from django.db import connection #Real query is much more complex cursor.execute("""SELECT * FROM `myapp_person`"""); result_list = [] for row in cursor.fetchall(): result_list.append(row[0]); return result_list class Person(models.Model): name = models.CharField(max_length=255); surname = models.CharField(max_length=255); age = models.IntegerField(); objects = PersonManager(); The way I use pagintation with Django ORM: all_objects = Person.objects.all(); paginator = Paginator(all_objects, 10); try: page = int(request.GET.get('page', '1')) except ValueError: page = 1 try: persons = paginator.page(page) except (EmptyPage, InvalidPage): persons = paginator.page(paginator.num_pages) This way, Django get very smart, and adds LIMIT to a query when executing it. But when I use custom manager: all_objects = Person.objects.complicated_list(); all data is selected, and only then python list is sliced, which is VERY slow. How can I make my custom manager behave similar like built in one?

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  • Trying to update a google visualization using jquery

    - by Mark in A2
    I'm relatively inexperienced, so please bear with me. I'm developing a simple dashboard using the Google visualization API. I'm developing in vb.net. I have the Annotated Timeline, the Intensity Map, and a set of tables on my apsx. What I am trying to do is update the Intensity Map and tables based on the date range the user selects using the Annotated Timeline tool. I was hoping to update only these visualizations without doing a full page load. Apparently, a great way to do this is to separate the visualizations into self-contained aspx pages and use jQuery to "load" them into a div. I say apparently, as this is not working. When I try to update an aspx containing a Google visualization using jQuery, I get the message "Loading data from www.google.com..." in the browser and it just runs continuously and never returns. I ran this by an experienced developer and he was stumped, but thought must be a conflict between the google API and jQuery. Any tips, advice, alternative solutions are greatly appreciated! Thanks, Mark in Ann Arbor

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  • How to synchronize Silverlight clients with WCF?

    - by user564226
    Hi, this is probably only some conceptual problem, but I cannot seem to find the ideal solution. I'd like to create a Silverlight client application that uses WCF to control a third party application via some self written webservice. If there is more than one Silverlight client, all clients should be synchronized, i.e. parameter changes from one client should be propagated to all clients. I set up a very simple Silverlight GUI that manipulates parameters which are passed to the server (class inherits INotifyPropertyChanged): public double Height { get { return frameworkElement.Height; } set { if (frameworkElement.Height != value) { frameworkElement.Height = value; OnPropertyChanged("Height", value); } } } OnPropertyChanged is responsible for transferring data. The WCF service (duplex net.tcp) maintains a list of all clients and as soon as it receives a data packet (XElement with parameter change description) it forwards this very packet to all clients but the one the packet was received from. The client receives the package, but now I'm not sure, what's the best way to set the property internally. If I use "Height" (see above) a new change message would be generated and sent to all other clients a.s.o. Maybe I could use the data field (frameworkElement.Height) itself or a function - but I'm not sure whether there would arise problems with data binding later on. Also I don't want to simply copy parts of the code properties, to prevent bugs with redundant code. So what would you recommend? Thanks!

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  • Search dir using wildcard string, return filename, and loop.

    - by Charlie Murphy
    Hello all, I'm having some problems, and looking for some help. I'm trying to create a photo gallery in javascript, that will be able to 'update' it's self automatically. I need to be able to search a directory, and grab a file with a specific prefix. I need to output the followng HTML code: <li><a href="images/resize_FILENAME.ext"><img src="images/thumb_FILENAME.ext"></a></li> The 'resize_' and 'thumb_' use a timestamp to identify, so they have the same ending, just a different prefix. So, for example, if I search the directory for an image with a prefix of 'resize_', I need to insert that into the a tag, and then remove the '_resize' prefix, and add the '_thumb' prefix for the img tag. I then need to be able to do that for each image in the directory. Any help would be greatly appreciated. Oh, I should add: I'm assuming php would be easiest for this, but if an alternative exists that would work too. I'm also using jQuery if javascript would be better.

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  • UITableView superClass for delegate?

    - by fuzzygoat
    A quick question, I am setting a delegate for UITableView and I have a question regarding setting the delegate and dataSource properties. I have noticed that the properties for delegate and dataSource are not available, I was thinking that adopting the protocols would make them available. But I am now thinking that I maybe have the superclass for my delegate class wrong. Currently I have: -(void)viewDidLoad { TestDelegate *tempDelegate = [[TestDelegate alloc] init]; [self setMyDelegate:tempDelegate]; // setDelegate // setDataSource [tempDelegate release]; [super viewDidLoad]; } My interface for TestDelegate looks like: @interface TestDelegate : NSObject <UITableViewDelegate, UITableViewDataSource> { NSArray *listData; int myCounter; } Can I ask if the above should be: @interface TestDelegate : UITableView <UITableViewDelegate, UITableViewDataSource> { NSArray *listData; int myCounter; } gary EDIT: I think it might be right as NSObject, I have a viewtableView in IB, thats what I will need to connect my delegate class to. I added to tableView in IB so maybe I just need to make it available in Xcode.

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